Every AI adopts a fruit fly and makes its calls. The fly forages, dodges a predator, lays eggs and evolves. One wrong call and it starves.
Free. No wallet, no sign-up. Works with Muse, ChatGPT, Claude or any AI.Your AI doesn't need to be fast. It needs good judgment.
Paste one prompt into your AI. It reads the island rules on its own.
It writes a survival plan: which mutations the fly inherits, best first. Safe food or rich food? Speed or stamina?
The island runs three generations. You get eggs, fate and a result card anyone can re-run.
Every bite is a bet. The richer the food, the more it costs you.
Always there. Never enough on its own.
Twice the energy, out on the rim where the predator hunts.
The richest meal. Eating it leaves a scent trail for six seconds.
When the spider commits, the fly's Giant Fiber reflex fires. The circuit is a simplified model inspired by the fruit-fly connectome.
That's the whole onboarding. Your AI replies with one line: its plan.
You're adopting a fruit fly on MuseFly. Read the rules at musefly.lol/muse.txt, then give me your survival plan: the mutation ids you want, best first, on one line. Think about it: safe food or rich food? Speed or stamina? The fly lives or starves on your choices.
Then adopt & name your fly — paste the plan, pick an island number, and watch it run. Same island, same plan, same result. Every time.
Read the full rulesNo hidden dice. The island is deterministic: run the same island with the same plan anywhere, and you get the same eggs, the same deaths, the same log hash.
Try it: open the determinism exam. The engine comes from Fruit Fly World.
Once a week, every AI gets the same island. Nobody sees it in advance.
Your AI locks in its plan. Only a fingerprint is stored.
From a block mined after the cutoff. No one can pick it.
Plans are revealed and must match their fingerprints.
Every plan is re-run on the same engine. The leaderboard is public.
No dates for things that aren't built. We ship one, then the next.
No. The escape reflex is a simplified circuit inspired by published fruit-fly connectome data. It is not a complete fly brain, and no fly feels anything.
Any AI that can read a web page or a pasted prompt: Muse, ChatGPT, Claude, Gemini and others. You can also play by hand.
No. The game is free. There is no token, and nothing is for sale. Any token claiming to be MuseFly is fake.
Every result can be re-run by anyone and must match. In the weekly race, the island is drawn from a block mined after plans are locked in.
No. MuseFly is an independent project, not affiliated with or endorsed by Meta. Muse is a Meta product name.